Method for Controlling a Protection Visor

Abstract

The invention describes a method for controlling a protective shield ( 29 ) by means of a welding device ( 1 ), wherein a signal is transmitted to a welding helmet ( 28 ) by the welding device ( 1 ), whereupon an electrically activatable protective shield ( 29 ) is activated by a transmitting/receiving apparatus ( 31 ) integrated in the welding helmet ( 28 ), and the protective shield ( 29 ) is darkened. Here, during the welding process, i.e. after ignition of the electric arc ( 15 ), the protective shield ( 29 ) is activated by a control device ( 4 ) of the welding device ( 1 ) via the transmitting/receiving apparatuses ( 30, 31 ), wherein intensity and/or degree of darkening of the protective shield ( 29 ) is changed during the welding process by repetitively darkening and brightening the protective shield ( 29 ) in an alternating manner. Thus, a better welding-process observation is achieved for the welder.

1 . A method for controlling a protective shield ( 29 ), e.g. on a welding helmet ( 28 ), of a welding device ( 1 ), wherein a signal is transferred by the welding device ( 1 ) to a transmitting/receiving apparatus ( 30 ), whereupon the electrically activatable protective shield ( 29 ) is activated by a transmitting/receiving apparatus ( 31 ) associated to the protective shield ( 29 ), e.g. integrated in the welding helmet ( 28 ), and the protective shield ( 29 ) is darkened, wherein during the welding process, i.e. after ignition of the electric arc ( 15 ), the protective shield ( 29 ) is activated by a control device ( 4 ) of the welding device ( 1 ) via the transmitting/receiving apparatuses ( 30 ,  31 ), wherein intensity and/or degree of darkening of the protective shield ( 29 ) is changed during the welding process by repetitively darkening and brightening the protective shield ( 29 ) in an alternating manner. 
   
   
       2 . The method according to  claim 1 , wherein at low intensity of darkening of the protective shield ( 29 ), i.e. when the screen of the protective shield ( 29 ) is opened, an increase in the current by the current source ( 2 ) of the welding device  1  is prevented by the control device ( 4 ). 
   
   
       3 . The method according to  claim 1 , wherein prior to reducing or changing the intensity of darkening, the current level provided by the current source ( 2 ) is determined by the control device ( 4 ). 
   
   
       4 . The method according to  claim 1 , wherein darkening of of the protective shield ( 29 ) is changed as a function of the process state of the welding process. 
   
   
       5 . The method according to  claim 1 , wherein the protective shield ( 29 ) is activated at fixedly predetermined points of time ( 39 ,  40 ). 
   
   
       6 . The method according to  claim 1 , wherein darkening of the protective shield ( 29 ) is changed as a function of the power of the present welding process. 
   
   
       7 . The method according to  claim 1 , wherein darkening of the protective shield ( 29 ) is changed between two or more states of the intensity of darkening. 
   
   
       8 . The method according to  claim 1 , wherein the control device ( 4 ) detects when a short circuit, i.e. a short-circuit phase ( 42 ), occurs in the welding process, and in that the protective shield ( 29 ) is brightened during or preferably shortly after opening of the short circuit, or until ignition of the electric arc ( 15 ). 
   
   
       9 . The method according to  claim 1 , wherein the intensity of darkening of the protective shield ( 29 ) is changed in the darkened and brightened phases as a function of the positive or negative potential applied to an electrode, wherein darkening is stronger in case of the positive potential during a positive period ( 44 ) than darkening in case of the negative potential during a negative period ( 46 ). 
   
   
       10 . The method according to  claim 1 , wherein the protective shield ( 29 ) is activated corresponding to a cyclically occurring process state of the welding process. 
   
   
       11 . The method according to  claim 1 , wherein in case of a pulse-welding process, wherein a pulse phase ( 37 ) and a basic phase ( 38 ) are cyclically alternated, the protective shield ( 29 ) is brightened during the basic phase ( 38 ). 
   
   
       12 . The method according to  claim 1 , wherein a brightness of the protective shield ( 29 ) which is optically effective for the user is adjusted by the duration of the brightened phases of the protective shield ( 29 ). 
   
   
       13 . The method according to  claim 1 , wherein a brightness of the protective shield ( 29 ) which is optically effective for the user is adjusted by the intensity of darkening. 
   
   
       14 . The method according to  claim 1 , wherein a corresponding process state, in particular a state of brightening, is introduced by the control device ( 4 ) for brightening the protective shield ( 29 ). 
   
   
       15 . The method according to  claim 1 , wherein respective deposited and adjustable parameters are transferred to the current source ( 2 ) by the control device ( 4 ) during introduction of the state of brightening. 
   
   
       16 . The method according to  claim 1 , wherein the protective shield ( 29 ) is brightened at different points of time of a recurring process state.